<template>
  <div class="app-container">
    <el-button @click="handleAddRole" type="primary">{{ $t('permission.addRole') }}</el-button>

    <el-table :data="rolesList" border style="width: 100%;margin-top:30px;">
      <el-table-column align="center" label="Role Key" width="220">
        <template slot-scope="scope">{{ scope.row.key }}</template>
      </el-table-column>
      <el-table-column align="center" label="Role Name" width="220">
        <template slot-scope="scope">{{ scope.row.name }}</template>
      </el-table-column>
      <el-table-column align="header-center" label="Description">
        <template slot-scope="scope">{{ scope.row.description }}</template>
      </el-table-column>
      <el-table-column align="center" label="Operations">
        <template slot-scope="scope">
          <el-button @click="handleEdit(scope)" size="small" type="primary">{{ $t('permission.editPermission') }}
          </el-button>
          <el-button @click="handleDelete(scope)" size="small" type="danger">{{ $t('permission.delete') }}</el-button>
        </template>
      </el-table-column>
    </el-table>

    <el-dialog :title="dialogType==='edit'?'Edit Role':'New Role'" :visible.sync="dialogVisible">
      <el-form :model="role" label-position="left" label-width="80px">
        <el-form-item label="Name">
          <el-input placeholder="Role Name" v-model="role.name"/>
        </el-form-item>
        <el-form-item label="Desc">
          <el-input
            :autosize="{ minRows: 2, maxRows: 4}"
            placeholder="Role Description"
            type="textarea"
            v-model="role.description"
          />
        </el-form-item>
        <el-form-item label="Menus">
          <el-tree :check-strictly="checkStrictly" :data="routesData" :props="defaultProps" class="permission-tree"
                   node-key="path" ref="tree" show-checkbox/>
        </el-form-item>
      </el-form>
      <div style="text-align:right;">
        <el-button @click="dialogVisible=false" type="danger">{{ $t('permission.cancel') }}</el-button>
        <el-button @click="confirmRole" type="primary">{{ $t('permission.confirm') }}</el-button>
      </div>
    </el-dialog>
  </div>

</template>

<script>
  import path from 'path'
  import {deepClone} from '@/utils'
  import {addRole, deleteRole, getRoles, getRoutes, updateRole} from '@/api/role'
  import i18n from '@/lang'

  const defaultRole = {
    key: '',
    name: '',
    description: '',
    routes: []
  };

  export default {
    data() {
      return {
        role: Object.assign({}, defaultRole),
        routes: [],
        rolesList: [],
        dialogVisible: false,
        dialogType: 'new',
        checkStrictly: false,
        defaultProps: {
          children: 'children',
          label: 'title'
        }
      }
    },
    computed: {
      routesData() {
        return this.routes
      }
    },
    created() {
      // Mock: get all routes and roles list from server
      this.getRoutes();
      this.getRoles();
    },
    methods: {
      async getRoutes() {
        const res = await getRoutes();
        this.serviceRoutes = res.data;
        const routes = this.generateRoutes(res.data);
        this.routes = this.i18n(routes);
      },
      async getRoles() {
        const res = await getRoles();
        this.rolesList = res.data;
      },
      i18n(routes) {
        const app = routes.map(route => {
          route.title = i18n.t(`route.${route.title}`);
          if (route.children) {
            route.children = this.i18n(route.children);
          }
          return route
        });
        return app;
      },
      // Reshape the routes structure so that it looks the same as the sidebar
      generateRoutes(routes, basePath = '/') {
        const res = [];

        for (let route of routes) {
          // skip some route
          if (route.hidden) {
            continue;
          }

          const onlyOneShowingChild = this.onlyOneShowingChild(route.children, route);

          if (route.children && onlyOneShowingChild && !route.alwaysShow) {
            route = onlyOneShowingChild;
          }

          const data = {
            path: path.resolve(basePath, route.path),
            title: route.meta && route.meta.title,

          };

          // recursive child routes
          if (route.children) {
            data.children = this.generateRoutes(route.children, data.path)
          }
          res.push(data)
        }
        return res
      },
      generateArr(routes) {
        let data = [];
        routes.forEach(route => {
          data.push(route);
          if (route.children) {
            const temp = this.generateArr(route.children);
            if (temp.length > 0) {
              data = [...data, ...temp]
            }
          }
        });
        return data
      },
      handleAddRole() {
        this.role = Object.assign({}, defaultRole);
        if (this.$refs.tree) {
          this.$refs.tree.setCheckedNodes([])
        }
        this.dialogType = 'new';
        this.dialogVisible = true
      },
      handleEdit(scope) {
        this.dialogType = 'edit';
        this.dialogVisible = true;
        this.checkStrictly = true;
        this.role = deepClone(scope.row);
        this.$nextTick(() => {
          const routes = this.generateRoutes(this.role.routes);
          this.$refs.tree.setCheckedNodes(this.generateArr(routes));
          // set checked state of a node not affects its father and child nodes
          this.checkStrictly = false
        })
      },
      handleDelete({$index, row}) {
        this.$confirm('Confirm to remove the role?', 'Warning', {
          confirmButtonText: 'Confirm',
          cancelButtonText: 'Cancel',
          type: 'warning'
        })
          .then(async () => {
            await deleteRole(row.id);
            this.rolesList.splice($index, 1);
            this.$message({
              type: 'success',
              message: 'Delete succed!'
            })
          })
          .catch(err => {
            console.error(err)
          })
      },
      generateTree(routes, basePath = '/', checkedKeys) {
        const res = [];

        for (const route of routes) {
          const routePath = path.resolve(basePath, route.path);

          // recursive child routes
          if (route.children) {
            route.children = this.generateTree(route.children, routePath, checkedKeys)
          }

          if (checkedKeys.includes(routePath) || (route.children && route.children.length >= 1)) {
            res.push(route)
          }
        }
        return res
      },
      async confirmRole() {
        const isEdit = this.dialogType === 'edit';

        const checkedKeys = this.$refs.tree.getCheckedKeys();
        this.role.routes = this.generateTree(deepClone(this.serviceRoutes), '/', checkedKeys);

        if (isEdit) {
          await updateRole(this.role.key, this.role);
          for (let index = 0; index < this.rolesList.length; index++) {
            if (this.rolesList[index].key === this.role.key) {
              this.rolesList.splice(index, 1, Object.assign({}, this.role));
              break
            }
          }
        } else {
          const {data} = await addRole(this.role);
          this.role.key = data;
          this.rolesList.push(this.role)
        }

        const {description, key, name} = this.role;
        this.dialogVisible = false;
        this.$notify({
          title: 'Success',
          dangerouslyUseHTMLString: true,
          message: `
            <div>Role Key: ${key}</div>
            <div>Role Nmae: ${name}</div>
            <div>Description: ${description}</div>
          `,
          type: 'success'
        })
      },
      // reference: src/view/layout/components/Sidebar/SidebarItem.vue
      onlyOneShowingChild(children = [], parent) {
        let onlyOneChild = null;
        const showingChildren = children.filter(item => !item.hidden);

        // When there is only one child route, the child route is displayed by default
        if (showingChildren.length === 1) {
          onlyOneChild = showingChildren[0];
          onlyOneChild.path = path.resolve(parent.path, onlyOneChild.path);
          return onlyOneChild
        }

        // Show parent if there are no child route to display
        if (showingChildren.length === 0) {
          onlyOneChild = {...parent, path: '', noShowingChildren: true};
          return onlyOneChild
        }

        return false
      }
    }
  }
</script>

<style lang="scss" scoped>
  .app-container {
    .roles-table {
      margin-top: 30px;
    }

    .permission-tree {
      margin-bottom: 30px;
    }
  }
</style>
